Display Window Optical Layer for Low Reflectance

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Solution Overview

Problem

Existing display devices face challenges in reducing light reflectance, which affects image visibility, particularly in foldable or rollable displays where conventional solutions do not adequately address the need for low reflectance and durability.

Innovation Solution

A display device with a window panel incorporating an optical layer featuring a glass substrate, a base layer, a first functional layer with a hard coating agent and anti-static properties, and a second functional layer containing a fluorine-containing silane compound, which provides low reflectance and anti-fouling properties, along with an optional impact-absorbing layer for enhanced durability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If conventional optical layers are used in display devices, then the structure is simple and easy to manufacture, but the reflectance is high which reduces image visibility

Engineering Contradiction:

Improveimage visibilityVSAvoidoptical layer structure

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The optical layer is divided into multiple functional sub-layers: a base layer, a first functional layer with hard coating and anti-static agents, and a second functional layer with fluorine-containing silane compound. This segmentation allows each layer to perform specific functions while collectively achieving low reflectance and high durability

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite material structures with different refractive indices arranged in specific sequences. The combination of materials with refractive indices ranging from 1.3 to 2.5 creates optical interference that reduces reflectance to 1.08%-5.00%, while maintaining mechanical strength and chemical resistance

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If the optical layer uses multiple functional layers to achieve low reflectance, then image visibility improves, but the manufacturing process becomes more complex

Engineering Contradiction:

Improveimage visibilityVSAvoidoptical layer fabrication

Core Design Contradiction:

Illumination intensityVSEase of manufacture

Solution Approach 1:

The patent optimizes specific parameters including layer thicknesses (30-120 nm for second functional layer), refractive indices (1.3-2.5 range), and chemical compositions (fluorine-containing silane compounds). These parameter optimizations enable low reflectance while maintaining compatibility with existing manufacturing processes

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional protective layers are applied, then the glass substrate is protected, but the reflectance remains high and chemical resistance is insufficient

Engineering Contradiction:

Improvechemical and wear resistanceVSAvoidlight reflectance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

Different regions of the optical layer are assigned different properties: the first functional layer provides hard coating and anti-static properties, while the second functional layer with fluorine-containing silane compound provides chemical resistance and low reflectance. This local differentiation optimizes both protection and optical performance

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the harmful effect of light reflection into a beneficial anti-fouling property through the fluorine-containing silane compound. The same low-refractive-index material that reduces reflectance also provides hydrophobic and oleophobic properties that prevent fingerprint and contaminant adhesion

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution achieves a reflectance of 1.08% to 5.00%, improving image visibility and durability by reducing external light reflection and enhancing chemical and wear resistance.

Implementation Method 1

an optical layer disposed on the glass substrate and having a reflectance of about 1.08% to about 5.00%

Methodology Applied

Scientific EffectOptical interference: Interference

Implementation Method 2

a first functional layer disposed on the base layer, wherein the first functional layer includes a hard coating agent

Methodology Applied

Scientific EffectHard coating: Coatings

Implementation Method 3

a first functional layer disposed on the base layer, wherein the first functional layer includes a hard coating agent and an anti-static agent

Methodology Applied

Scientific EffectAnti-static effect: Electrostatics

Implementation Method 4

a second functional layer disposed on the first functional layer, wherein the second functional layer includes a fluorine-containing silane compound

Methodology Applied

Scientific EffectHydrophobic effect: Hydrophobe

Data Source

PatentUS20220344623A1Display device

Publication Date: 2022.10.27 SAMSUNG DISPLAY CO LTD

AI summary

A display device including: a display module; a color filter layer disposed on the display module; and a window panel disposed on the color filter layer, wherein the window panel includes a glass substrate adjacent to the color filter layer, and an optical layer disposed on the glass substrate and having a reflectance of about 1.08% to about 5.00%, wherein the optical layer includes a base layer adjacent to the glass substrate, a first functional layer disposed on the base layer, wherein the first functional layer includes a hard coating agent and an anti-static agent, and a second functional layer disposed on the first functional layer, wherein the second functional layer includes a fluorine-containing silane compound.